A_M Posted September 15, 2012 Report Share Posted September 15, 2012 Hi! I have a doubt related with NDVI images. How make accuracy from a NDVI difference image? How to create an error matrix with the classes "increase", "decrease" and "no change"? I created train sites in the right places but now I don't know how to create an error matrix on ENVI 4 or ArcGIS (if it is possible). In ENVI 4, Classification > Post-Classification > Confusion Matrix > Using Ground Truth ROIs, ENVI 4 tells that need a Classification Image and my NDVI difference image doesn't fill this requirement. What can I do? With ArcGIS this can be made too? And with GDAL? Thanks a lot!! Quote Link to comment Share on other sites More sharing options...
rahmansunbeam Posted September 16, 2012 Report Share Posted September 16, 2012 http://www.google.com/url?sa=t&rct=j&q=accuracy%20assessment%20in%20envi&source=web&cd=3&cad=rja&ved=0CDUQFjAC&url=http%3A%2F%2Fwww.exelisvis.com%2Fportals%2F0%2Ftutorials%2Fenvi%2FClassification_Methods.pdf&ei=z1JVUPbJDtDyrQePuIHYDA&usg=AFQjCNHMnhtm-vSjh5hMabdnGO02DGE7oA Quote Link to comment Share on other sites More sharing options...
A_M Posted September 16, 2012 Author Report Share Posted September 16, 2012 In ENVI 4, Classification > Post-Classification > Confusion Matrix > Using Ground Truth ROIs, ENVI 4 tells that need a Classification Image and my NDVI difference image doesn't fill this requirement. -> that gives me an error because is a NDVI image and doesn't have classification (I think is because of that...) Quote Link to comment Share on other sites More sharing options...
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